1. When they built the Great Wall of China, the workers were angered and resentful and it strained the economy.
  2. People would break their limbs and injure themselves and break laws to avoid going into the military.
  3. One of it's Emperors, Emperor Yang, spent a lot of money and his was really cruel to the people.
  4. It had a short "lifetime".
  5. They attacked Korea four times, and Korea defeated them all those times.